Abstract
Photoexciting an emissive material can lead to refrigeration, a phenomenon known as laser cooling. Laser cooling relies on a highly efficient phonon-assisted single-photon up-conversion anti-Stokes photoluminescence (SP-ASPL). In practice, achieving laser cooling requires nearly perfect emission quantum yields (QYs) and SP-ASPL up-conversion efficiency.CsPbBr3 nanocrystals (NCs) are promising for this purpose due to their near-perfect QYs and efficient SP-ASPL up-conversion. We've developed a consistent method to produce NCs with near-perfect QYs (QY>96%). Our nuclear magnetic resonance studies reveal that the close-packing surface is key to these high QYs. Further investigation of these NCs shows a near-unity SP-ASPL up-conversion efficiency (~100%) in our obtained CsPbBr3 NC, which does not follow the typical Arrhenius behavior. Our developed polaron model helps explain this phenomenon. These findings lay the groundwork for advancing laser cooling using CsPbBr3 NCs.
Published Version
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